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I would use the new F30 numbers as a comparison to past model to get a good idea of real world. My sticker on a 2008 335i was 18/27 and I get approx. 21 mpg in combined driving - the new F30 335i should get about 26/27 combined in ral world which is pretty good. (New 328i should be about 2mpg better than that)
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